>> pelley: tonight,thedefensesecretarywarns of new attacks etd destructive as pearl harbor and 9/11. theyey could contaminate the water supply in major cities. >> pelley: david martin on the threat of cyber warfare. did the vice president get it the vibout the deadly attack in libya? >> we weren't told they wanted more security. >> pelley: reports from jan crawford and nancy cordes. fos angeles makes space for a rdes.craft as "endeavour" lands in its new home. bill whitaker is there. and steve hartman "on the road." whey were separated at birth. whitake're together till death do they part. >> reporter: so you think this th ats meant to be? >> absolutely. match made in heaven. captioning sponsored by cbs this is the "cbs evening news" with scott pelley. >> pelley: good evening. the united states is facing an attack threat equivalent to 9/11, an attack that would be carried out by computer. that was the stark warning from defense secretary leon panetta. he described a cyber pearl harbor in which attackers could take over computers that control the transportation system or a u

actually talked to his attorney during thehearing.defenseattorneydaniel king said even four months into the case, as he put it, we have not begun to understand the nature and depth of mr. holmes' mental illness. this is the second time the defense has referred to holmes' mental illness, but there was no suggestion that would be his defense. for that, he would need a psychiatric evaluation that could take six months. and now there is concern from both prosecution and the defense about the well-being of witnesses, including dr. lynne fenton, the psychiatrist holmes saw when he was a student at the university of colorado. because her name has been made public, including her appearance at a hearing in august, prosecutors say she hasn't been able to live at home. this investigation has already generated close to 20,000 documents, but witnesses are still being interviewed and evidence analyzed and the case could reach an extraordinary tens to hundreds of thousands more documents. both sides say they're going to need a lot more time to deal with all of this information. the judge will dec

, nancy cordes and john dickerson. convicted rapist jerry sandusky makes aramblingdefenseofhis innocence, but the judge has the final word. armen keteyian on the sentencing of the former penn state coach. elizabeth palmer takes us inside the compound in libya where the u.s. ambassador died, in his own bedroom. and byron pitts with angels in overalls. >> reporter: how do you see these women? are they girlfriends? neighbors? >> they're my heroes! (laughs) captioning sponsored by cbs this is the "cbs evening news" with scott pelley. >> pelley: good evening. as of today we are down to the final four weeks of the presidential campaign. the focus is narrowing, not just to the nine battleground states but to one in particular-- ohio, which could tip the balance on election night. first the big picture. nationally, the latest gallup poll shows mitt romney leading president obama 49% to 47%. that spread is within the margin of error, so it's essentially a tie. in ohio, new polling today shows this: pollster a.r.g. has romney up by one point, 48% to 47%. but a cnn poll has the president

referred to holmes' mental illness, but there was no suggestion that would behisdefense. dr that, he would need a psychiatric evaluation that could take six months. and now there is concern from both prosecution and the defense about about the well-being of witnesses, including dr. lynne atnton, the psychiatrist holmes saw when he was a student at the university of colorado. macause her name has been made pearanceincluding her appearance at a hearing in august, prosecutors say she hasn't been tion has ave at home. this investigation has already generated close to 20,000 documents, but witnesses are still being interviewed and evidence analyzed and the case could reach an extraordinary tens to hundreds of thousands more documents. both sides say they're going to need a lot more time to deal with all of this information. the judge will decide later this month about postponing a hearing perhaps until early next year. earing to ng to decide if there is enough evidence to go to old yo girllley: barry, thank you. we told you last night about ta that 14-year-old pakistani girl who was shot